Tuning oxygen content and distribution by substitution at Co site in 112 YBaCo2O5+delta : impact on transport and thermal expansion properties / Urusova A. S.,Cherepanov V. A.,Lebedev O. I.,Aksenova T. V.,Gavrilova L. Ya,Caignaert V.,Raveau B. // JOURNAL OF MATERIALS CHEMISTRY A. - 2014. - V. 2, l. 23. - P. 8823-8832.

ISSN/EISSN:

2050-7488 / 2050-7496

Type:

Article

Abstract:

Polycrystalline ``112{''} ordered oxygen deficient double perovskites YBaCo2-xMexO5+delta (Me = Fe, Cu, Ni) were synthesized by a glycerol-nitrate route with 0.0 <= x <= 0.7 for Me = Fe, 0.0 <= x <= 0.6 for Me = Cu and x = 0.1 for Me = Ni. The combined X-ray diffraction, electron microscopy and thermo-gravimetric studies show that all these oxides exhibit the a(p) x a(p) x 2a(p) tetragonal structure (S. G. P4/mmm); moreover, the oxygen content increases continuously with x in the iron-substituted oxide YBaCo2-xMexO5+delta, whereas the opposite is observed for the copper phase YBaCo2-xMexO5+delta. This difference, which is due to the more electropositive character of Fe3+ compared to Cu2+, is hindered in the Ni2+ case due to its inability to accommodate the pyramidal coordination. The changes of the conductivity of these compounds versus temperature are closely related to their oxygen loss, in agreement with a defect structure model suggested earlier. Thermal expansion measurements prove the absence of phase transition in all oxides within the temperature range studied. The chemical compatibility of YBaCo1.4Fe0.6O5+delta with the electrolyte Ce0.8Sm0.2O2-delta is also demonstrated.

Author keywords:

OXIDE FUEL-CELLS; CRYSTAL-STRUCTURE; DEFECT STRUCTURE; PHYSICAL-PROPERTIES; HIGH-TEMPERATURE; PEROVSKITE; NONSTOICHIOMETRY; CATHODES; 0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1; LNBACO(2)O(5+DELTA)

DOI:

10.1039/c4ta01264j

Web of Science ID:

ISI:000336848600034

Соавторы в МНС:

Другие поля

Поле	Значение
Publisher	ROYAL SOC CHEMISTRY
Address	THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Language	English
EISSN	2050-7496
Keywords-Plus	OXIDE FUEL-CELLS; CRYSTAL-STRUCTURE; DEFECT STRUCTURE; PHYSICAL-PROPERTIES; HIGH-TEMPERATURE; PEROVSKITE; NONSTOICHIOMETRY; CATHODES; 0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1; LNBACO(2)O(5+DELTA)
Research-Areas	Chemistry; Energy \& Fuels; Materials Science
Web-of-Science-Categories	Chemistry, Physical; Energy \& Fuels; Materials Science, Multidisciplinary
Author-Email	vladimir.cherepanov@usu.ru
ResearcherID-Numbers	Lebedev, Oleg/B-4443-2014 Cherepanov, Vladimir/E-6451-2014
ORCID-Numbers	Cherepanov, Vladimir/0000-0003-3653-6459
Funding-Acknowledgement	Russian Foundation for Basic Research {[}13-03-00958]; Ural Federal University
Funding-Text	This work was financially supported in partially by the Russian Foundation for Basic Research (Project no. 13-03-00958) and by the Ural Federal University under the Framework Program of development through the ``Young scientists UrFU{''} competition.
Number-of-Cited-References	31
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	24
Journal-ISO	J. Mater. Chem. A
Doc-Delivery-Number	AI4PZ